IDL: Merge duplicating local variable assignment in attribute_getter

Source/bindings/templates/attributes.cpp

Index: Source/bindings/templates/attributes.cpp
diff --git a/Source/bindings/templates/attributes.cpp b/Source/bindings/templates/attributes.cpp
index e7393c1a409ff84431f950c7336801b24634aa35..2a9cfc87f9f3e028fa004d3ea2839b90a10a64f6 100644
--- a/Source/bindings/templates/attributes.cpp
+++ b/Source/bindings/templates/attributes.cpp
@@ -48,13 +48,8 @@ const v8::PropertyCallbackInfo<v8::Value>& info
     {% if attribute.is_nullable and not attribute.has_type_checking_nullable %}
     bool isNull = false;
     {% endif %}
-    {# FIXME: consider always using a local variable for value #}
-    {% if attribute.cached_attribute_validation_method or
-          attribute.is_getter_raises_exception or
-          attribute.is_nullable or
-          attribute.reflect_only or
-          attribute.idl_type == 'EventHandler' %}
-    {{attribute.cpp_type}} {{attribute.cpp_value}} = {{attribute.cpp_value_original}};
+    {% if attribute.cpp_value_original %}
+    {{attribute.cpp_type}} {{attribute.cpp_value}}({{attribute.cpp_value_original}});
     {% endif %}
     {# Checks #}
     {% if attribute.is_getter_raises_exception %}
@@ -89,11 +84,9 @@ const v8::PropertyCallbackInfo<v8::Value>& info
     {% endif %}
     {# v8SetReturnValue #}
     {% if attribute.is_keep_alive_for_gc %}
-    {# FIXME: merge local variable assignment with above #}
-    {{attribute.cpp_type}} result({{attribute.cpp_value}});
-    if (result && DOMDataStore::setReturnValueFromWrapper{{world_suffix}}<{{attribute.v8_type}}>(info.GetReturnValue(), result.get()))
+    if ({{attribute.cpp_value}} && DOMDataStore::setReturnValueFromWrapper{{world_suffix}}<{{attribute.v8_type}}>(info.GetReturnValue(), {{attribute.cpp_value}}.get()))
         return;
-    v8::Handle<v8::Value> wrapper = toV8(result.get(), holder, info.GetIsolate());
+    v8::Handle<v8::Value> wrapper = toV8({{attribute.cpp_value}}.get(), holder, info.GetIsolate());
     if (!wrapper.IsEmpty()) {
         V8HiddenValue::setHiddenValue(info.GetIsolate(), holder, v8AtomicString(info.GetIsolate(), "{{attribute.name}}"), wrapper);
         {{attribute.v8_set_return_value}};